1-(4&#39;-(beta-acylamino-ethylsulfonyl)-phenyl)-3-aryl- delta2-pyrazolines



United States Patent Ofice 3,522,242

Patented July 28, 1970 wh'ch at the n't o e of th 'd h t l t e n 3,522,242 1 1 T g 11 e aml e ave a eas on y drogen atom. I

The reaction takes place according to the following Erich Schinzel, Frankfurt am Main, Siegfried Bildstein, Scheme- Kelkheim, Taunus, and Karl Heinz Lebkucher, Hof- 5 H2C--CR H2C-CR heim, Taunus, Germany, assignors to Farbwerke H I ll g Q Hoechst Aktiengesellschaft vormals Meister Lucius & 2 2

Bruning, Frankfurt am Main, Germany, a corporation N of Germany I I No Drawing. Filed July 14, 1967, Ser. No. 653,323

Int. or. com 49/10 US. Cl. 260-2393 8 Claims I Rx ABSTRACT OF THE DISCLOSURE SIOPGHCHZ SOTCHFGHHIFFR This addition takes place while heating an intimate mixture of the vinylsulfone compound with the carboxylic acid or sulfonic acid amide in the presence of cat- 1-[4'-(B-acylamino-ethylsulfonyl)-phenyl] 3 aryl-A pyrazolines of the Formula A HzC-CR alytical quantities of alkaline agents, preferably in the I presence of sodium methylate, to temperatures of 100- 200 C., preferably 115 l40 C.

I As carboxylic acid or sulfonic acid amides which at the nitrogen of the amide have at least one hydrogen atom, there may be mentioned, for example: acetamide, propionic acid amide, n-butyric acid amide, isobutyric R1 acid amide, n-valerianic acid amide, iso-valerianic acid I amide, capronic acid amide, diethylacetic amide, hexa- SOFCHPCHFNJPEZ hydro benzamide, 4-methyl-hexahydrobenzamide, benzamide, 4-methyl-benzamide, 4-chloro-benzamide, 4-moethoxyand 4-ethoxy-benzamide, cinnamic acid amide,

N-methylacetamide, N-ethylacetamide, N-n-propyland N-iso-propyl-acetamide, N-n-butyl-acetamide, N-iso-butylacetamide, N-dodecyl-acetamide, N-stearyl-acetamide, N-

methyl heXahydro-benzamide, N-methyl-benzamide, N-

methyl-cinnamic acid amide, acetanilide, 2-, 3- and 4-acetamino-toluene, 4-acetaminoo-anisol, 4-acetamino-phenetol, 4-acetamino-chlorobenzene, N-benzyl-acetamide, n-

butyric acid anilide, hexahydro-benzanilide, benzanilide,

cinnamic acid anilide, methanesulfonic acid amide, ethanesulfonic acid amide, benzene-sulfonic acid amide,

wherein R represents phenyl or p-chloro-phenyl, Y stands for carbonyl or sulfonyl, R represents hydrogen, alkyl containing up to 20 carbon atoms, phenyl, lower alkoxy 30 phenyl, or benzyl, and R represents alkyl containing from 1 to 4 carbon atoms, cycloalkyl, phenyl, p-tolyl, lower alkoxy-phenyl, arylphenyl or styryl, and process for their manufacture.

The present invention relates to new pyrazoline derivatives, preferably 1-[4-( 8-acylamino ethylsulfonyl)- phenyl]-3-aryl-A -pyrazolines, in particular those of the general Formu A benzene sulfonic acid methylamide, toluene-4-sulfonic H2C-CR acid amide, toluene-4-sulfonic acid-methylamide, toluene-4-sulfonic acid-butylamide, toluene-4-sulfonic acid stearylamide, toluene-4-sulfonic acid anilide, toluene-4- I sufonic acid-benzylamide.

Another process for the preparation of the compounds according to the present invention consists in reacting 1-[4'-(B amino-ethylsulfonyl)-phenyl]-3-aryl-A -pyraZo- R1 lines which at the nitrogen of the amine have at least I one hydrogen atom and which may be obtained, for S O 2CH2C HzNY-R2 5 0 example, according to the method described in Canadian in which R represents an aryl radical, which may be sub- Pat. No. 758,075 with carboxylic acid and sulfonic acid stituted, in particular a phenyl radical and preferably a chlorides according to the following reaction equation: p-chlorophenyl radical, Y a -CO group or SO group, R represents hydrogen, an alkyl group with up H2C(7*R to 20 carbon atoms, a phenyl radical which may be sub- H2 N H2O N stituted, or an aralkyl radical, and R a lower alkyl group,

a cycloalkyl group, an aryl radical which may be subl stituted, and the styryl group, as well as a process for HX their preparation and then use as opt1cal brlghteners.

Now it has been found, that the 1-[4'-( 8-acylaminoethylsulfonyl)-phenyl]-3-aryl-A -pyrazolines of the gen- Ilir I 1'21 eral Formula A can be obtained by adding to 1-(4-vinyl- SOrCHrOHFNH sulfonylphenyl)-3-aryl-A -pyrazolines, obtainable, for example according to the method described in US. Pat. This reaction is carried out in the presence of acid fix- No. 3,255,203, carboxylic acid or sulfonic acid amines 6 ing agents, for example, in the presence of pyridine bases,

3 at temperatures ranging between l00 0, preferably at 0-45 C.

As carboxylic acid and sulfonic acid chlorides there may be mentioned, for example: acetic acid chloride, propionic acid chloride, n-butyric acid chloride, isobutyric acid chloride, n-valerianic acid chloride, hexahydrobenzoylchloride, 4 methyl-hexahydrobenzoylchloride, benzoylchloride, 4-methylbenzoylchloride, 4-chlorobenzoylchloride, 4-methoxy and 4-ethoxy-benzoylchloride, diphenyl-4-carboxylic acid chloride, cinnamic acid chloride, methane-sulfonic acid chloride, ethane-sulfonic acid chloride, benzenesulfonic acid chloride, toluene-4-sulfonic acid chloride.

As 1-(4'-vinylsulfonyl-phenyl) 3 aryl-A -pyrazolines and 1 [4' (fl-aminoethylsulfonyl)-phenyl] 3 aryl-A pyrazolines there are to be mentioned, for instance, those in which the aryl radical represents a phenyl radical or an alkylated, alkoxylated, halogenated phenyl radical or one which has an acylamino group, for instance 4-methylphenyl-, 4-methoxyphenyl-, 4-acetaminophenyl-, 4-ethoxyphenyl-, 4-bromophenyl-, and 3,4-dichlorophenyl-. Of particular interest are those compounds in which the aryl radical (R) represents a phenyl or p-chloro-phenyl radical.

Furthermore, the compounds according to the present invention can be obtained by the action of alkylating agents as, for instance, dimethylor diethylsulfate on those compounds of the general Formula A, in which R represents a hydrogen atom and Y a -SO group.

The condensation of eventually substituted w-chloropropiophenones with phenyl-hydrazines which in position p have the fiSO CH CI-l NY-R -radical leads to A -pyrazolines of the general Formula A as well.

The mentioned substituents R, R R and Y have the means given above, X stands for chlorine.

The A -pyrazolines of the general Formula A, obtained according to the present invention, are almost colourless or respectively weakly yellow products which are especially appropriate as UV-absorbents for materials to be reproduced such, for example, as papers.

It has furthermore been found that almost colourless or respectively weakly yellow, fluorescing A -pyrazolines of the general formula can be used with excellent results as optical brighteners.

The new compounds distinguish by their outstanding fluorescing capacity and good fastness to light when brightening fibrous materials of cotton, polyacrylonitrile, and its copolymers, above all, however, of cellulose 21/ 2- and triacetate, polyamide and wool.

The compounds according to the present invention are distinguished furthermore, by a very good resistance to hypochlorite and waste gases. The resistance to waste gases is in particular 'in the case of brightening agents for cellulose 21/2 and triacetate fibres a most valuable property. The brightening agents according to the present invention can be applied in known manner, either in form of solutions in organic solvents or in form of aqueous dispersions, eventually with the aid of dispersing agents. The quantities required, which may vary within wide limits are easily to be determined by preliminary tests.

The new compounds can be added to commercial detergents, even if these contain oxidative bleaching agents such, for example, as perborate, in order to improve the aspect of the washed goods. Furthermore, the new com pounds can as well be applied together with reductive chemical bleaching agents, e.g. sodium dithionite, sodium boron-hydride, and the like.

The new substances may be applied in combination with appropriate textile auxiliary agents, such as antistatics, plasticizers, hydrophobizing agents and the like, whereby good brightening and impregnating effects are obtained in one operating phase only. Another field of application of these substances consists in their use in dye-baths, being obtained vivid, brilliant tints, which are especially desired in the case of pastel shades. Furthermore, they can be added to spinning and moulding masses, consisting for example of polymerization products of vinyl chloride, vinylidene chloride, polyethylene, polypropylene and others which serve for the manufacture of man-made fibres, filaments, films, foils, ribbons and other structures.

The following examples are intended to show the multifold possibilities of application.

EXAMPLE 1 41.6 parts by weight of 1-(4-vinylsulfonyl-phenyl)-3- (p-chlorophenyl)-A -pyrazoline are together with 12 parts by weight of acetamide and 2 parts by weight of sodium methylate intimately mixed and heated to -140" C. for 10 minutes. The melt formed solidifies soon. After cooling off, the crystallization product is ground, extracted by boiling together with 200 parts by volume of methanol, separated from the non-dissolved parts and after-"washed with 200 parts by volume of cold methanol. The acetamide addition product VI (cf. table) shows, after recrystalllizing several times from glacial acetic acid, a melting point of 21l212 C.

EXAMPLE 2 9.36 parts by weight of l-(4'-vinylsulfonyl-phenyl)-3- phenyl-A -pyrazoline are, together with 2.95 parts by weight of acetamide and 0.5 part by weight of sodium methylate, intimately mixed and heated for 10 minutes to 115-120 C. The melt formed solidifies while cooling. The crystallization product is ground and extracted with 40 parts by volume of cold methanol. The additional product corresponding to Formula I (cf. table) shows, after recrystallizing several times from methanol, a melting point of 147-148 C.

EXAMPLE 3 13.6 parts by weight of 1-[4'-(fi-benzylamino-ethylsulfonyl)-phenyl]-3-(p-chlorophenyl) A pyrazoline are pasted up in 40 parts by volume of pyridine. At 0-5 0., 6 parts by weight of 4-methoxy-benzoylchloride are added dropwise and then it is stirred for 1 /2 hours at room temperature. The reaction product is treated with approximately 100 parts by volume of methanol, cooled in the ice-bath and the acylation product which has precipitated is filtered off with suction and washed with methanol. Thus obtained Compound XV (cf. table) shows, after recrystallizing several times from methanol, a melting point of 122-124 C.

EXAMPLE 4 12.57 parts by weight of 1-[4'-(ti-'benzylamino-ethylsulfonyl)-phenyl]-3-phenyl-A -pyrazoline are brought into 40 parts by volume of pyridine and at 0-10 C. added dropwise to 5.0 parts by weight of methane-sulfochloride, while stirring. Then the batch is heated to 40-45 C., the temperature is maintained for one hour, cooled down to room temperature again and the precipitate is filtered off with suction and Washed with methanol. After recrystallizing several times from chlorobenzene the sulfonamide melts at -l76 C.

EXAMPLE 5 10.4 parts by weight of 1-(4-vinylsulfony1phenyl)-3- (p-chlorophenyl)-A -pyrazoline are intimately mixed together with 9 parts by weight of toluene-4-sulfonamide and 1 part by weight of sodium methylate and heated for 5 minutes to 160-180 C. The melt formed is triturated, after cooling off, with 60 parts by volume of methanol whereby crystallization occurs. It is filtered off with suction and after-washed with methanol. After recrystallizing several times from chlorobenzene the compounds obtained XIX (cf. table) has a melting point of ZOO-202 C.

EXAMPLE 6 13.6 parts by weight of 1- [4' (li-benzylamino-ethylsulfonyl) -phenyl] -3- (p-chlorophenyl -A -pyrazoline are dissolved in 4 parts by volume of pyridine and, at a temperature of 0-5 C. added dropwise with 7.5 parts of acetylchloride. Then it is stirred for approximately 1 hour at 40-45 C., the batch is put on ice, the acetylation product which has formed is filtered off with suction after solidifying and thoroughly washed with water. After recrystallizing several times from methanol the Compound IV (cf. table) obtained melts at 159-160 C.

EXAMPLE 7 A cellulose 2 /2 acetate fabric which has been prebleached in the usual manner is treated with an aqueous dispersion (goods-to-liquor ratio of 1:20) which contains per litre 0.15 g. of Compound VI (cf. table) and 1 ml. of formic acid (at 85% strength) for 30 minutes at a temperature of 80 C. The ascertainment of the degree of whiteness which is effected with the Zeiss-Elephro device at a wave length of 460 shows an increase of 20% in comparison with the non-brightened fabric.

In order to obtain the aqueous dispersion 0.15 g. of Compound VI were dissolved in 7.5 1. of dimethylformamide and this solution was introduced into 1 l. of hot water containing 0.38 g. of the dissolved oxethylation product out of nonlyphenol and 23 moles of ethyleneoxide.

A cellulose triacetate fabric bleached in the same way shows an improvement in the degree of whiteness of EXAMPLE 8 A woolen fabric bleached in the usual manner is treated, at a goods-to-liquor ratio of 1:20, at 60 C., for 45 minutes with an aqueous dispersion which contains per litre 0.3 g. of Compound I (cf. table) 1.2 g. of sodium dithionite and 0.8 g. of sodium pyrophosphate By this treatment an increase in the degree of whiteness of 11% is to be realised.

The aqueous dispersion was prepared in the manner indicated in Example 7.

EXAMPLE 9 A bleached woolen fabric is treated for 45 minutes in a long bath (1:20) at C. with an aqueous dispersion which contains per litre 0.2 g. of Compound XV (cf. table) 1.2 g. of sodium dithionite and 0.8 g. of sodium pyrophosphate The result of this treatment is an improvement of the degree of whiteness of 10% in comparison to the nonbrightened fabric.

The aqueous dispersion was prepared analogously to Example 7.

EXAMPLE 10 A fabric consisting of at least of polyacrylonitrile is, at a goods-to-liquor ratio of 1:20, treated for 30 minutes at 98 C. with an aqueous dispersion which contains per litre 0.2 g. of Compound I (of. table) 1 ml. of formic acid (at 85 strength) and 1 g. of alkylarylpolyglycol ether The improvement of the whitening effect as compared to the original fabric amounts to 10%.

If instead of Compound I Compound V is used in the same quantity the operation remaining the same, the brightening effect amounts to 10% as well.

The disperson was prepared as described in Example 7.

EXAMPLE 11 A polycaprolactam fabric bleached in the usual way is treated at 60 C. at a goods-to-liquor ratio of 1:20 for 30 minutes with an aqueous dispersion which contains per litre 0.15 g. of Compound XIX (cf. table) and 1.00 g. of sodium carbonate In comparison to the non-brightened fabric .an increase in the degree of whiteness of 10% is achieved.

The aqueous dispersion was prepared in the manner described in Example 7. When applying the same quantity of Compound I instead of XIX the increase in reflectance is 12%, when using Compound IX 10%.

A brightening effect of 10% is equally obtained if the same quantity of Compound VI and 1 ml. of formic acid instead of sodium carbonate are used, the other conditions remaining the same.

TABLE No. R Y R1 R2 M.P.,

r c0- H -0H. 147-148 I1 Same as above- -GO 'OH2C6H5 CH@ -132 III .do -o0 0o113 I -CH3 178-179 IV -do sol- -H CH3 199-201 TABLE-Continued N0. R Y R1 R M.P.,

V dO ---S O:- -CH C H5 -CH 175-176 VI --o1 -oo- -H -H, 211-212 vII Same as 21001 0-..- -0o-- CH3 175-177 VIII dO -o0- -OCI-I; -o113 100-101 IX dO OO -CHCH5 CH 159-160 X dO --C 0- -H -C HgCHgCHa 205-207 CH CHi XI .do CO -H -G H O H: 272-274 C HzCHf XII dO CO-- 0 H Same as above 166-167 270-272 XIII -oo- 41 XIv dO o0- -OH; --oo113 102100 XV do-... GO- CH2O0H Same as above 122-124 XvI do -oo- -o113 XVII dO -00- --CH; -0 H=OH- 198-200 XVIII dO -SOg -CHgCsH5 -CHz 210-211 XIX do -s0,- H -0Hi 200-202 XX "do SO CH; Sameasabove 181-183 XXI -.d0 -so1 -O H0(n) do 161-162 XXII -.do s01 4318113101) do 126-127 XXIII dO -s0,- Q ".100 183-185 XXIV -SO:- -H CHa 186-187 We claim: 1 to 4 carbon atoms cycloalkyl, phenyl, p-toyl lower 1. 1-[4-(/3-acylamino ethylsulfonyl) phenyl]-3-arylalkoxy-phenyl, biphenylyl or styryl. A- -pyrazoline of the formula (2) The compound of the formula 2. The compound of the formula Q Ih SO2CH2CHz-NYR2 wherein R represents phenyl or p-chloro-phenyl, Y stands for carbonyl or sulfonyl, R represents hydrogen, alkyl S02 CH2 OHFNH CO CH: containing up to 20 carbon atoms, phenyl, lower alkoxy 3. Compound as defined in claim 1 wherein R is pphenyl, or benzyl and R represents alkyl containing from chloro phenyl, R is H, Y is carbonyl and R is n-propyl.

4. Compound as defined in claim 1 wherein R is pchloro phenyl, R is H, Y is carbonyl and R is phenyl.

5. Compound as defined in claim 1 wherein R is pchloro phenyl, R is H, Y is sulfonyl and R is methyl.

6. Compound as defined in claim 1 wherein R is phenyl, R is H, Y is carbonyl and R is methyl.

7. Compound as defined in claim 1 wherein R is pchloro phenyl, R is H, Y is sulfonyl and R is p-methylphenyl.

8. Compound as defined in claim 1 wherein R is pchloro phenyl, R is benzyl, Y is carbonyl and R is pmethoxyphenyl.

1 0 References Cited UNITED STATES PATENTS 6/1966 Schinzel et a1 260--239.9 5/1964 Sarkar et a1. 260310 NORMA S. MILESTONE, Primary Examiner C. M. SHURKO, Assistant Examiner 

